DFI CD9A3 series - Manual (Page 19)

www.dfi .com Chapter 3 Hardware Installation
19
Chapter 3
Signal Pin# Pin Type Pwr Rail /Tolerance CD9A3 Series Carrier Board Description
SPI_CS# B97 O CMOS 3.3V Suspend/3.3V
Connect a series resistor 33ȟ to Carrier
Board SPI Device CS# pin
Chip select for Carrier Board SPI - may be sourced from chipset SPI0 or SPI1
SPI_MISO A92 I CMOS 3.3V Suspend/3.3V
Connect a series resistor 33ȟ to Carrier
Board SPI Device SO pin
Data in to Module from Carrier SPI
SPI_MOSI A95 O CMOS 3.3V Suspend/3.3V
Connect a series resistor 33ȟ to Carrier
Board SPI Device SI pin
Data out from Module to Carrier SPI
SPI_CLK A94 O CMOS 3.3V Suspend/3.3V Connect a series resistor 33ȟ to Carrier
Board SPI Device SCK pin Clock from Module to Carrier SPI
SPI_POWER A91 O 3.3V Suspend/3.3V
Power supply for Carrier Board SPI – sourced from Module – nominally
3.3V. The Module shall provide a minimum of 100mA on SPI_POWER.
Carriers shall use less than 100mA of SPI_POWER. SPI_POWER
shall only be used to power SPI devices on the Carrier
BIOS_DIS0# A34
BIOS_DIS1# B88
Signal Pin# Pin Type Pwr Rail /Tolerance CD9A3 Series Carrier Board Description
SER0_TX A98 O CMOS
5V / 12V(design 3.3v~5V
tolerant)
PD 4.7K General purpose serial port 0 transmitter
SER0_RX A99 I CMOS
5V / 12V(design 3.3v~5V
tolerant)
PU 47K to 3.3V General purpose serial port 0 receiver
SER1_TX A101 O CMOS
5V / 12V(design 3.3v~5V
tolerant)
PD 4.7K General purpose serial port 1 transmitter
SER1_RX A102 I CMOS
5V / 12V(design 3.3v~5V
tolerant)
PU 47K to 3.3V General purpose serial port 1 receiver
Signal Pin# Pin Type Pwr Rail /Tolerance CD9A3 Series Carrier Board Description
I2C_CK B33 I/O OD CMOS 3.3V Suspend/3.3V PU 2.2K to 3.3VSB General purpose I2C port clock output
I2C_DAT B34 I/O OD CMOS 3.3V Suspend/3.3V PU 2.2K to 3.3VSB General purpose I2C port data I/O line
SPKR B32 O CMOS 3.3V / 3.3V
Output for audio enunciator - the "speaker" in PC-AT systems.
This port provides the PC beep signal and is mostly intended for
debugging purposes.
WDT B27 O CMOS 3.3V / 3.3V Output indicating that a watchdog time-out event has occurred.
FAN_PWNOUT B101 O OD CMOS 3.3V / 12V Fan speed control. Uses the Pulse Width Modulation (PWM) technique to control the fan's RPM.
FAN_TACHIN B102 I OD CMOS 3.3V / 12V Fan tachometer input for a fan with a two pulse output.
TPM_PP A96 I CMOS 3.3V / 3.3V
Trusted Platform Module (TPM) Physical Presence pin. Active high.
TPM chip has an internal pull down. This signal is used to indicate
Physical Presence to the TPM.
(NC for CD9A3)
Signal Pin# Pin Type Pwr Rail /Tolerance CD9A3 Series Carrier Board Description
PWRBTN# B12 I CMOS 3.3V Suspend/3.3V PU 10K to 3.3VSB
A falling edge creates a power button event. Power button events can
be used to bring a system out of S5 soft off and other suspend states,
as well as powering the system down.
SYS_RESET# B49 I CMOS 3.3V Suspend/3.3V PU 10K to 3.3VSB
Reset button input. Active low request for Module to reset and reboot.
May be falling edge sensitive. For situations when SYS_RESET# is
not able to reestablish control of the system, PWR_OK or a power
cycle may be used.
CB_RESET# B50 O CMOS 3.3V Suspend/3.3V
Reset output from Module to Carrier Board. Active low. Issued by
Module chipset and may result from a low SYS_RESET# input, a low
PWR_OK input, a VCC_12V power input that falls below the minimum
specification, a watchdog timeout, or may be initiated by the Module
software.
PWR_OK B24 I CMOS 3.3V / 3.3V PU 10K to 3.3V
Power OK from main power supply. A high value indicates that the
power is good. This signal can be used to hold off Module startup to
allow Carrier based FPGAs or other configurable devices time to be
programmed.
SUS_STAT# B18 O CMOS 3.3V Suspend/3.3V Indicates imminent suspend operation; used to notify LPC devices.
SUS_S3# A15 O CMOS 3.3V Suspend/3.3V
Indicates system is in Suspend to RAM state. Active low output. An
inverted copy of SUS_S3# on the Carrier Board may be used to
enable the non-standby power on a typical ATX supply.
Serial Interface Signals Descriptions
Miscellaneous Signal Descriptions
NA
Selection straps to determine the BIOS boot device.
The Carrier should only float these or pull them low, please refer to
COM Express Module Base Specification Revision 2.1 for strapping options of BIOS disable signals.
SPI Signals Descriptions
I CMOS
Power and System Management Signals Descriptions